maybe you freeze it with ice and than try scrubbing it off....
Scrape it off with a craft knife.
Using a very sharp craft knive carefully get an edge of the glue and flick it off.
Carefully scrape it off with a scalpel or sharp craft knife.
Scrape it off with a chisel or sharp craft knife. Remove residue with Goof -Off.
Craft tables in California can be purchased at craft stores such as Michaels and many other independent craft type stores. There are also many online websites that carry the tables.
Without knowing which glue my reply may sound odd. but simply try a sharp craft knife under the edge of the glue and flick it off.
Scrape it gently with a craft knife held nearly parallel to the tile.
You can carefully remove large pieces with a craft knife used flat, then get the residue with 'Goof Off'
Rub it with a rag dipped in Goof Off, when it's soft, peel it up with a craft knife.
I would cut it off with a very sharp craft knife.
If it's a glass lens, soften it with Goof-Off , then carefully scrape it off with a craft knife. - If they are plastic lenses as many are these days, I don't think it will come off.
If you mean from the back off tile that has come off a wall or floor - soak the tile for 3-4 hours in hot water, then most glues will wipe off. If you mean glue that has got on front of laid tile, use a sharp craft knife to get under the edge and flick it off.